Comment 5 for bug 1811506

Reviewed: https://review.openstack.org/631654
Committed: https://git.openstack.org/cgit/openstack/neutron-fwaas/commit/?id=55874d06b1ce80b44356310c930f80e834d83a8a
Submitter: Zuul
Branch: master

commit 55874d06b1ce80b44356310c930f80e834d83a8a
Author: Akihiro Motoki <email address hidden>
Date: Fri Jan 18 06:29:33 2019 +0900

    Change netns tests with oslo.privsep to check netns links

    It turns out that pyroute2.netns.setns() changes a network
    namespace of a thread instead of that of a process when it is
    called in a thread [1].

    What we actually would like to check in test_in_namespace test
    is whether operations against a network namespace work with
    oslo.privsep expectedly. There is no need to check namespace inode.

    This commit changes test_in_namespace test to check a list of
    network devices in a namespace to check netns operation works
    correctly. What the new test does are:
    - create a network namespace for testing
    - create a veth pair and move one of them to the network namespace
    - call oslo.privsep entrypoint function to retrieve a list of
      network devices inside the netns

    [1] http://lists.openstack.org/pipermail/openstack-discuss/2019-January/001761.html

    Closes-Bug: #1811506
    Change-Id: Ie5b238f1df707ea3ce50b5711ff791bac2681a2f